Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
Quantum dots for illumination are preferably applied directly on chip such that they can be applied in the same configuration as regular phosphors used for down conversion on blue LEDs to create white light of a desired color temperature. We here report the use of red quantum dots as a narrow band red down conversion material. Because the emission of photons outside the eye-sensitivity curve is minimized, this leads to improvements in the efficiency compared to state of the art materials of 5% for cool white and 15% for warm white LEDs. in the application LEDs have to operate at high blue flux, high temperature and humidity for long times. The developed technology meets the requirements set for these conditions, which will be outlined in this presentation. When incorporated into lamps, the gains may be larger because the LEDs can be driven at lower temperature and drive current, which makes them more efficient.
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